Duplex feeding mechanism for sewing machines



July' 28, 1936. H. FELDMANN 2,049,292

DUPLEX FEEDING MECHANISM FOR SEWING MACHINES Filed April l1, 1935 -5 rSheets-Sheet 1 ATTORNEY July 28 1936. H. FELDMANN 2,049,292

DUPLEX FEEDING MECHANISM FOR SEWING MACHINES Filed April l1, 1935 5 Sheets-Sheet 2 l i f f3 37. 0

i FJ; .2 /f 33 16 Z9 21 I9 l o /1 Z8 o 20 G 6 60 9i/)v 69 ,61 HENRY FEL UMA/wv INVENTOR.

A TTORNEY DUPLEX FEEDING MECHANISM FOR SEWING MACHINES Filedl Apri1 11, v 1955 5 sheets-sheet s HENRY FE?. DMA NN 60,- 1NVENToR.`

ATTORNEY Patented July 28, 1936 2,049,292 f DUPLEX FEEDING MECHANISM Fon SEWING MACHINES Henry Feldmann, Brooklyn, N. Y., assignor to Joseph Galkin Corporation, New York, N. Y., a corporation of New York Application April 11, 1935, serial No. 15,747

3 Claims.

' attaching waistbands and belt loops to trousers.

Another object of this invention is to mount the upper feed-roller in a bracket attached to the sewing machine frame for up'and down movement independent of the lifter-foot of the sewing machine.

Another object of this invention is to cause pressure against the upper feed-roller by a spring mounted in longitudinal alignment with the feedroller' shaft, the pressure on the roller being independent of the lifter-bar.

With the above and other objects in view, the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawings and pointed out yin the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in, which:

lFigure 1 is a front view of a sewing machine embodying my duplex roller feeding mechanism.

Figure 2 is an end view, partly in section and showing the-manner of mounting the feed rollers.

Figure 3 is a fragmentary end view partly in section, the section being taken as on line 3--3 in Figure 1, and shows clutch mechanism for driving the feed roller shafts with a step-bystep or intermittent movement.

Figure 4 is a sectional view, the section being taken as on line 4-4 in Figure 1, and shows brake mechanism for preventing reverse movement of the feed roller shafts.`

50 the numeral I0 indicates the work supporting 55 at its free end. In the head I3 is journaled the In the illustrated embodiment of the invention,

usual reciprocatory needle-bar I4 carrying a needle I5. The needle-bar is reciprocated by a lever I6 mounted on a pivot shaft Il. A looptaker I6 is oscillated and cooperates with the needle to form straight line stitching as is well known in the sewing machine art. The material worked upon is held down by a presser foot I9 resting on a cloth plate secured to and above the work supporting base I0'.

The presser foot I9 is pivotally connected to 10 a presser foot shank 2l by means of a screw 22 and a pressure is maintained upon said foot by means of a coil spring 23 housed in a recess in the upper portion of the shank 2I and which reacts against the upper portionof a presser foot bracket 24. The shank 2I is slidably mounted for extensive vertical motion in the bracket 24. The bracket 24 is mounted in slidable relation to the head I3 of the sewing machine. It is to be noted that the presser foot I9 is designed 20 mainly for vertical sliding motion', the pivotal motion of .the presser foot about the screw 22 being limited to vary slight rocking motions by pins projecting from the shank 2|.

This invention relates particularly to a duplex feeding mechanism comprising a positively driven knurled roller or rfeed-wheel 25 mounted abovethe work supporting base IIJ, and a positively driven knurled roller or feed-wheel 26 mounted below said base and projecting above an aperture formed in the cloth plate 20, each of said rollers having intersecting grooves which provide diamond-shaped projections disposed so as to eliminate interengagement thereof. The upper feedroller 25 is rotated by a shaft 21. .The end of the roller 25 adjacent the needle I5 is rotatablymounted on a stud 28 projecting from the bracket 24. The bracket 24 is fastened to a vertical lifter pin 29 which lis slidably mounted for vertical motion in a bearing3l. The bracket 24 is also mounted for vertical sliding motion on a guide bar 32, secured in bearing 33 in the head I3. The lifter pin 29 has a head L34 at its upper end which is elevated to permit a forked arm 35 to engage the head of the lifter pin 29. The forked arm 35 is fixed to a lifter bar 36 which is slidably mounted in bearings in the head I3. The lifter bar may be raised by a lever 31.. When the lifter bar 36 is raised, the attached forked arm 35 also raises the lifter pin 29, the bracket 24 and the upper feed roller 25. An arcuate leaf spring 3B bears at one end on a spring rest 39 and at the other end on a ball 4I) seated in the top face of the bracket 24, and this pressure is transhub of the feed roller 25. An adjusting screw 42 threaded in a bracket 43 rests on the spring 38 at about its middle and causes the spring to press on .the ball 46 and to force the feed' roller 25 yieldingly in a downward direction against the lower feed roller 26. 'Ihe lower feed roller 26 is rotated by a shaft 44 which is mounted longitudinally of said sewing machine in bearings 45 and 46 attached to the base plate 41 of the sewing machine. Intermeshing gears 48 and 49 mounted on the shafts 21 and 44 connect the rollers 25 and 26 into rotary cooperating relation. Both of the feed rollers have lmln'led operating faces which engage the fabric'to be fed,

and enables the rollers to grip a fabric between them and to impart positive feeding movements both from above and below the fabric whenV the rollers are rotated concomitantly by the gears 48 and 49.

The upper -feed roller 25 -is slidably movable vertically in a straight line with and also independently of the lifter bar 3,6. The presser foot I9 is also slidably movable vertically in a straight line independent of the vertical motion of the roller 25. These relative vertical sliding motions areof great advantage when the sewing machine is used for attaching looped waistbands to trousers in which operation the presser foot has first to rise to the top of the'loop while the` roller is in a lower position on the trouser 'fabric and wherein the roller then rises to the top of the loop while the presser foot is in a lower position.

It is desired that a positive rotary step-bystep driving or feeding motion be imparted to the shaft 21, to a universal joint 56, and to the feed rollers 2 5 and 26 without lost motion, and

that a longer or shorter step-by-step or intermittent motion may be had and modified at will within a considerable range of adjustment.. For this purpose I employ an oscillatable clutching detent carrier 55 mounted within a casing 561, xed to the shaft 21, as best shown in Figure 3. A

Acover plate 5l having an arm 58 has been fastened to the clutching detent carrier 55. The arm 58 is pivotally connected at one end to a link 51, fastened to a crank arm 59 'on a rockshaft 66. The rock-shaft, 60 receives'its movements from the main actuating shaft 6I of the sewing machine through a series of parts which include an adjustable crank 62 on the end of the vmain actuating shaft 6I, as shown in Figure 2.

In order to positively prevent reverse .movement of the shafts 21` and 44 without lost motion, I have provided a braking detent carrier 65 mounted within the casing 56, as best shown in Figure 4. A cover plate 66 having an arm 61 has been fastened to the braking detent carrier 65. 'I'hearmy 61 is secured to the spring, rest member 39 which is fastened to the base plate 41 of the sewing machine.

The clutch detent carrier 55 and the braking detent carrier 65 are mounted on the shaft 21 to work in opposite directions and may be in the form shown and described in Patent No. 1,985,406, issued to Nathan B. Galkin, dated December 25,

1934. By actuating a screw 69, Figure 2, theA crank 62 is caused to move to or away from the center of the shaft 6l and causes a link 10 to impart a larger or smaller swing to the rock shaft 66, to the arm 59, to the link 51 and to the clutch arm 58. The clutch arm 58 is secured to the cover plate 5l and to the clutch detent carrier 55. The swing of the arm 58 imparts an intermitaoeaeaea4 tent rotation to the casing 56 and through `a screw 68 to the shafts 21 and 44. The screw 69 thus serves to modify the feeding movements imparted to the feeding rollers 25 and '26. The braking detent carrier'beingiixed tothe sew- 5 ing machine frame, causes the shaft 21 to be gripped at the Aend of each feeding movement without any lost motion or back-lash at the feed rollers. The hub of,the fed roller 25 and the shaft 21 may be coupled by meansof a uni- 10 versal joint 5|) so that power imparted to the, shaft 21-will be transmitted to the roller 25 whateveroperative position said roller may occupy.

As best shown in Figure 4, the spring 36 is mounted in central alignment with the axis of 15 the shaft 21 and the roller 25 and this axial alignment insures ease.of vertical sliding motion necessary for quickly repeated reciprocations incident to high speed sewing machine operation.

I claim:

1. A two-roller feed mechanism for sewing machines having a head, said feed mechanism being designed to independently and concomitantly grip l f and feed superposed layers of fabric having widelyv spaced upper and lower surfaces, said feed mech- 25 anism comprising an upper positively driven feed roller rotatably mounted horizontally and being movable in a vertical plane, a lower positively driven feed roller rotatably mounted horizontallyand rotated concomitantly `with said upper roller30 by means of intermeshing gears, each of said rollershaving intersecting grooves which provide diamond-shaped projections disposed so as to eliminate interengagement thereof, a presser foot yieldingly pressing on the material-being stitched, 35 said feeding mechanism being located in the rear of said presser foot, means for supporting a carrier on which said upper feed roller and said foot are 'separately mounted for independent vertical sliding motion relative to each other and relative to said head, an elongated leaf-spring positioned in alignment with said upper feed roller axis for yieldingly depressing said carrier, roller detent clutch means for imparting step-by-step rotary movements to said feed rollers in one direction and roller detent clutch means for preventing reverse movement of said feed rollers.

2. A two-roller feed mechanism for sewing machines having a head, said feed mechanism being designed to independently and concomitantly grip and feed superposed layers of fabric having widely spaced upper and lower surfaces-said feed mechanism comprising an upper positively driven. feed roller rotatably mounted horizontally and being movable in a vertical plane, a lower positively drivenfeed roller rotatably mounted horlzontally and rotated concomitantly with said upper roller, each of said rollers havingintersecting grooves which provide diamond-shaped projections disposed so as to eliminate interengagement ei) thereof, a presser foot yieldingly pressing on the material being stitched, said feeding mechanism being located in the'rear of said presser foot, means for supporting a. carrier on which said upper feed roller and said foot are separately 65 `mounted for independent vertical sliding motion having widely spaced upper and lower surfaces, comprising an upper positively driven feed roller rotatably mounted horizontally and being movable in n vertical plane, a lower positively driven feed roller rotatably mounted horizontally and .rotated concomitantly with said upper roller, a

presser foot yieldingly pressing on the material being stitched, said feeding mechanism being located in the rear of said presser foot, said upper feed roller and said foot being separately mounted for independent vertical sliding motion, said presser foot being movable vertically without affecting the vertical position or the rotation of said upper 'feed roller. means for yieldingly depressing said upper roller, means for imparting step-by-` step rotary movements to` said feed rollers in one direction and means for preventing reverse movement of said feed rollers, said lower roller being mounted at one end of a shaft positioned below the work supporting base of the sewing machine, said shaft extending longitudinally of said machine and having a gear mounted at its other end for driving said lower roller, said feed mechanism being designed to permit insertion of fabric inter- 10 mediate said rollers with the Vedges thereof disposed beyond the ends of the rollers. 

